My father has a 2000 Chevy IMPALA, he is trying to decide whether to keep or sell. The car has 176, 600 miles on it. The problem is that the car keeps cracking the spark plug ( the 3rd spark plug) This is a six cylinder car. We have had new ignition coil, sensors, plug wires, security sensors put on this car. Our mechanic of 30 plus years, does not know what is the cause of this problem.
When driving this car it runs fine. However, when stopped or going slow the engine stalls. However, it always(knock on wood) starts right back up. Any help or advice would be appreciated. We have till the end of March due to the fact the car will not pass VA safety inspect, unless we can locate and fix the problem.